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December 35 0, 2.009 x 10 3 1. What is the molar mass (g) of lithium hydroxide, LiOH? 2. How many atoms are in 2.05 moles of O 2 ? (Train Tracks!) 3. Challenge! How many grams are in 0.35 moles of Argon? (Train Tracks) Please take out HW to be stamped! Grab a calculator or take yours out too! Slide 2 Todays Agenda Catalyst HW Review Applying Stoichiometry to Chemical Reactions Practice, Practice, Practiceand more PRACTICE! Exit Question Slide 3 Todays Objectives SWBAT perform stoichiometry to convert between moles, number of particles, and molar mass. Slide 4 Exit Question from Yesterday 1. What is a mole? 2. Calculate the molar mass of H 2 CO 3. Slide 5 Molar Mass 1 mol KNO 3 = 101 g K = 39 g + N = 14 g + O = (3)16 = 48 g Slide 6 Molar Mass- Lets try a another type of problem 1 mol KNO 3 = 101 g If we have 3.5 moles of KNO 3 (instead of just 1 mole!), how many grams would we have? Slide 7 Molar Mass 1 mol CH 4 = 12.01 g If we have 20 grams CH 4, how many moles of CH 4 do we have? Slide 8 Practice Time! 1, 11, 16 we will go over to show you how to solve this hilarious assignment! Attach your work on a separate sheet of paper. Mole Facts on the back! Slide 9 S molar Ratio Smore Equation: How do you make a S more? 2 GC + 1 M + 2 C 1 Smore GC = Graham Cracker M = Marshmallow C = Chocolate Pieces Slide 10 2 GC + 1 M + 2 C 1 Smore What does this mean? For every 2 graham crackers, how many smores do we produce? If we had 6 pieces of chocolates, how many smores could we make? If we had 6 marshmallows, how many smores could we make? Slide 11 Its the same thing with reactions Key Point #1: There are 3 steps to solving stoichiometric problems involving chemical reactions: 1) Balance the equation 2) Figure out what to what 3) Convert using train tracks Slide 12 Three Types of Stoichiometric Problems Key Point #2: There are 3 types of stoichiometric problems: 1) Mole to mole 2) Mole to mass 3) Mass to mass Slide 13 Stoich-i-ncredible: Mole to Mole! Balanced Equation: Remember! Coefficents = Moles __ Al + __ O 2 __ Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? First we have to balance the eq. FIRST STEP??? Slide 14 Balanced Equation: Coefficents = Moles 4 Al + 3 O 2 2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? SECOND STEP??? What to what? Mol O2 Mol Al2O3 Stoich-i-ncredible: Mole to Mole! Slide 15 Balanced Equation: Coefficents = Moles 4 Al + 3 O 2 2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? THIRD STEP??? Train Tracks! Stoich-i-ncredible: Mole to Mole! Slide 16 Balanced Equation: Coefficents = Moles 4 Al + 3 O 2 2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? 9 mol O 2 mol Al 2 O 3 mol O 2 WHAT IS THE CONVERSION FACTOR???!?!?!?!?!? Stoich-i-ncredible: Mole to Mole! Slide 17 Balanced Equation: Coefficents = Moles 4 Al + 3 O 2 2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? 9 mol O 2 2 mol Al 2 O 3 3 mol O 2 Stoich-i-ncredible: Mole to Mole! Slide 18 Balanced Equation: Coefficents = Moles 4 Al + 3 O 2 2 Al 2 O 3 If we have 9 moles of O 2, how many moles of Al 2 O 3 would form? 9 mol O 2 2 mol Al 2 O 3 = 6 mol Al 2 O 3 3 mol O 2 Stoich-i-ncredible: Mole to Mole! Slide 19 Your Turn! Mole to Mole! Balanced Equation: Coefficents = Moles __Co + __ F 2 __CoF 3 How many moles are CoF 3 are produced when 1.25 moles of Co reacts? Slide 20 What about this?? Is it still mole to mole? Balanced Equation: Coefficents = Moles __ S 8 + __ O 2 __ SO 2 If we start with 2.5 moles S 8 how many moles of O 2 are needed for S 8 to fully combust? Slide 21 Can you step it up?? Mole to Mass Balanced Equation: Coefficents = Moles __ KCl + __ O 2 __ KClO 3 How many moles of KClO 3 will form if we start with 64 grams of O 2 ? Slide 22 Balanced Equation: Coefficents = Moles 2 KCl + 3 O 2 2 KClO 3 How many moles of KClO 3 will form if we start With 64 grams of O 2 ? 64 g O 2 Can you step it up?? Mole to Mass Slide 23 Balanced Equation: Coefficents = Moles NH 4 NO 3 N 2 O + 2 H 2 O How many moles of NH 4 NO 3 is needed to produce 25 grams of H 2 O? Your Turn!!! Mole to Mass Slide 24 The hardest type! Mass to Mass! Balanced Equation: Coefficents = Moles __ N 2 + __ H 2 __ NH 3 How many grams of NH 3 would be produced if 56 grams of N 2 are reacted? Slide 25 Another Example! Mass to Mass Balanced Equation: Coefficents = Moles __ Fe + __ H 2 O __ Fe 3 O 4 + __ H 2 How many grams of Fe 3 O 4 will form if we start with 9 grams of H 2 O? Slide 26 More Practice Balanced Equation: Coefficents = Moles __ H 2 + __ O 2 __ H 2 O How many grams of H 2 O will form if we start with 3.0 moles H 2 ? Slide 27 Practice, Practice, Practice Did I mention practice? Balanced Equation: Coefficents = Moles __ Cu + __ AgNO 3 __ Cu(NO 3 ) 2 + __ Ag How many grams of Ag would form if we react 8 grams AgNO 3 ? Slide 28 Can you help each other step it up?? Sage and Scribe! (if we have time) Find a partner in the class and follow directions. After you finish, begin HW. Slide 29 Exit Question Consider the reaction: Cu + AgNO 3 Ag + Cu(NO 3 ) 2 1. If you start with 63.55 grams of copper (Cu), how many grams of silver (Ag) will be produced? Dont forget to BALANCE!